Ac Bridges Pdf. 16 1 a for which the condition of balance is that r1 r4 r2 r3 or r1 r3 r2 r4 inductances and capacitances can also be measured by a similar four arm bridge as shown in fig. Ac bridge 3 the basic circuit of an ac bridge is exactly the same as the wheatstone bridge circuit except that impedances are used instead of resistances and the supply is an ac source.
Ac bridges are similar to wheatstone bridge in which d c. Also the null detector must be an ac instrument. Instead of using a source of direct current alternating current.
From equation 1 and 2 the following points.
The resistors of bridge are replaced with combination of resistor inductor and capacitors i e. Chapter 4 ac bridges free download as pdf file pdf text file txt or view presentation slides online. Schering bridge schering bridge used for the measurement of capacitance and dielectric loss of a capacitor. Bridgesresistances can be measured by direct current wheatstone bridge shown in fig.
